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以Cu-Ag-Mo药芯焊丝为焊接中间层过渡材料,对TA1/Q345双金属层状复合板进行熔焊试验。利用SEM、EDS和XRD等分析方法对接头元素分布、相组成及组织构成进行了微观分析,并进行了焊缝区显微硬度测试。结果表明:钛焊缝中,微量的Fe向上扩散形成了少量的金属间化合物Ti Fe,在拉伸应力的作用下产生了裂纹,但在过渡层中的Ag元素具有很好的流动性,填补了裂纹,阻碍了裂纹的扩展;过渡层Mo元素与扩散Ti形成了连续固溶体,降低了过渡区中扩散Ti的含量,控制了Ti、Fe金属间化合物的生成;焊缝区的显微硬度值整体呈下降趋势,但其中钛焊缝与过渡层界面处的硬度值高达475 HV0.1,该区域的主要相为Ti Cu和Ti2Cu,降低了焊接接头塑韧性。
The Cu-Ag-Mo flux-cored wire was used as the transition material for the welding intermediate layer, and the welding test of the TA1 / Q345 bimetal layered composite plate was carried out. The elemental distribution, phase composition and microstructure of the joint were analyzed microscopically by means of SEM, EDS and XRD, and the microhardness of weld zone was tested. The results show that a small amount of Fe is diffused upwards to form a small amount of intermetallic compound Ti Fe in the titanium weld, and cracks occur under the tensile stress. However, the Ag element in the transition layer has good fluidity to fill up Cracked, hindered the crack growth; the transition layer of Mo element and the diffusion of Ti formed a continuous solid solution, reducing the transition zone diffusion of Ti content, controlling the formation of Ti, Fe intermetallic compounds; weld zone microhardness value However, the hardness at the interface between titanium weld and transitional layer is as high as 475 HV0.1. The main phases in this region are Ti Cu and Ti2Cu, which reduces the plasticity and toughness of the welded joints.